CSS: Tag style
The main problem with using attributes to define styles is that they are overloaded. Often, HTML markup contains very many elements, and when you add styles, there ends up being much more code, which is bad for reading the markup.
The second problem is fixing the styles. To do this, you must first find the desired element in the code, and then edit its styles. There may be 10, 20, or 100 such elements on the page. And for tags with the same name, you have to write styles for each element separately.
There is a natural desire to have all the styles in one place where you can quickly edit them. One solution is to use the <style> tag which can hold all of the necessary styles.
Let's take an example from the last lesson:
<div style="font-size: 20px;">
This text will have a font size of 20 pixels
<p>The enclosed paragraph will also have a font size of 20 pixels</p>
</div>
To get rid of the attributes, let's add a style tag and specify that the <div> tag uses a font size of 20 pixels.
<style>
div {
font-size: 20px;
}
</style>
<div>
This text will have a font size of 20 pixels
<p>The enclosed paragraph will also have a font size of 20 pixels</p>
</div>
In the same way, you can specify that the paragraph will have a font size of 10 pixels
<style>
div {
font-size: 20px;
}
p {
font-size: 10px;
}
</style>
<div>
This text will have a font size of 20 pixels
<p>The enclosed paragraph will have a font size of 10 pixels</p>
</div>
Inside the tag <style> used a construction in this form:
tag_name {
property: value;
}
Anything written before the opening bracket { is called a selector. Selectors are the rules by which the browser determines which element to add styles to. We'll get to know some of the selectors a little later. In the examples above, selectors are used by tag, i.e., styles will be applied to all elements with the tag specified as a selector
/* All div elements will be set to a font size of 20px */
div {
font-size: 20px;
}
Instructions
Add a paragraph to the editor and, using the style tag, set the font size to 10 pixels
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Your exercise will be checked with these tests:
1const { test } = require('tests');
2
3test(({ query, expect }) => {
4 const styleTag = query(document, 'style');
5 expect(styleTag).to.be.visible;
6
7 const paragraph = query(document, 'p')
8 const styleP = getComputedStyle(paragraph);
9
10 expect(styleP).to.have.property('font-size', '10px');
11});
12Teacher's solution will be available in:
